Electrical Conductivity of Multiwall Carbon Nanotube Bundles Contacting with Metal Electrodes by Nano Manipulators inside SEM

Yang, Quan; Ma, Li; Xiao, Shungen; Zhang, Dongxing; Djoulde, Aristide; Ye, Maosheng; Lin, Yini; Geng, Song-Chao; Li, Xuan; Chen, Tao; Sun, Lining

doi:10.3390/nano11051290

Cited by 12 publications

(5 citation statements)

References 51 publications

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“…Figure 4c,d shows the our PDOS of the first layer of Au atoms and the C atoms nearest to the Au surface. 42 The PDOS of the C atom p orbital and Au atom d orbital has a smaller value near the Fermi level than that of Pt atoms. The strong hybrid orbital was not formed between the p orbital of the C atoms and the d orbital of the first layer of Au atoms.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…In this case, electrons can easily migrate between compressed CNTs and the Pt surface, which is beneficial for bond forming to reduce contact resistance. Figure c,d shows the our PDOS of the first layer of Au atoms and the C atoms nearest to the Au surface . The PDOS of the C atom p orbital and Au atom d orbital has a smaller value near the Fermi level than that of Pt atoms.…”

Section: Resultsmentioning

confidence: 98%

“…The theoretical researches give the relationship of contact resistance and radial compression deformation. − The experimental studies on how the microscopic contact configuration between metals and CNTs influences the contact resistance have been rarely reported. Here, we provide the mechanism research on the relationship between radial compression deformation of CNTs and its contact resistance using the hybrid atomic force microscopy–scanning electron microscopy (AFM–SEM) technique. − …”

Section: Introductionmentioning

confidence: 99%

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Establishing Ohmic Contact of a Radial Compressed CNT Bundle with High Work Function Metal

Yang,

Gong,

Xiao

et al. 2024

Langmuir

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Establishing low-resistance ohmic contact is critical for developing electronic devices based on traditional silicon and new low-dimensional materials. Due to unprecedented electronic and mechanical properties, the one-dimensional carbon nanotubes (CNTs) have been used as source/drain, gate, or tunnel to fabricate transistors. However, the mechanism causing low-resistance ohmic contact is not clear yet. Here, the hybrid atomic force microscopy−scanning electron microscopy (AFM− SEM) instrument was developed to establish lower-resistance ohmic contact between a radial compressed deformed multiwalled CNT bundle and high work function metal (platinum and gold). The radial compression structure under strong van der Waals attraction was in situ characterized through the SEM image to obtain the diameter and width and through AFM to get height and to perform nanoindentation, indicating that Pt has the smaller radial compression deformation. Molecular dynamics simulations exhibit that compared to Pt, a wider ribbon-like graphene layer formed when the radial compressed CNTs contacted with Au. The bond forming and electron orbital overlapping between C atoms of deformed CNTs and the high work function metal atom is beneficial for good electrical contact.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Establishing Ohmic Contact of a Radial Compressed CNT Bundle with High Work Function Metal

Yang,

Gong,

Xiao

et al. 2024

Langmuir

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“…The model consisted of a series structure of contact resistance and CNTB resistance, and the intertube and interwall of MWCNT are parallel structures. There is tunneling resistance between each wall and each tube that can be activated under certain conditions …”

Section: Modelmentioning

confidence: 99%

Welding Model for a Carbon Nanotube Bundle with Staggered Electrodes: Implications for Conductivity with Joule Heating

Ouyang

Lin

et al. 2023

ACS Appl. Nano Mater.

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Carbon nanotubes (CNTs) have excellent electrical properties. However, it is challenging to demonstrate these properties in actual electrochemical measurements fully. Previous research has improved the electrical properties of CNTs through welding experiments. But the mechanism of the conductivity enhancement is still unclear. The welding process lacks adequate mechanistic studies and theoretical models. This article presents a theoretical model of a CNT circuit with staggered electrodes, which considers the effect of twist angle on a CNT bundle. A welding model of the CNT bundle circuit is also developed based on the structural changes of CNTs after welding and characterized by the resistance ratio of the CNT circuit pre- and post-welding. The welding model is analyzed to explore how the quantity, diameter, and length of CNTs in the bundle affect the welding effect. An electrical measurement system for CNTs was established to validate the welding model using a nanomanipulation system compatible with a scanning electron microscope. Then, a constant voltage and long-duration electric welding experiment was performed, which showed that the conductivity was enhanced about 1.5–4 times after welding. The results also demonstrated that longer and fewer CNTs in the bundle could improve the electrical conductivity by the welding process more significantly. These findings were consistent with the trend of the welding model. This article establishes a welding theoretical model of the CNT bundle with staggered electrodes, which effectively accounts for the electrical conductivity enhancement during CNT welding and will help more fully express excellent performance in carbon-based nanoelectronic devices, nanoelectromechanical systems, and electrocatalysts in its manufacturing stage.

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“…In previous work, the authors demonstrated a nanometrology method based on nanorobotic manipulation inside an SEM chamber to easily manipulate suspended nanostructures. − This nanoprobing strategy is relatively easy to assemble and cost-effective, enabling testing of numerous NWs with reduced experimental efforts when examining electrical properties. This is in contrast to conventional electrical characterization methods that employ nanolithography-based techniques for manipulating and establishing electrical contacts with a single NW.…”

Section: Introductionmentioning

confidence: 99%

Electrical Activity and Extremes of Individual Suspended ZnO Nanowires for 3D Nanoelectronic Applications

Djoulde,

He,

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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We explored the electrical activity and extremes inside individual suspended zinc oxide (ZnO) nanowires (NWs) (diameter: 50–550 nm, length: 5–50 μm) subjected to high forward bias-induced Joule heating using two-terminal current–voltage measurements. NWs were isolated using a reproducible nanometrology technique, employing a nanomanipulator inside a scanning electron microscope. Schottky behavior is observed between installed tips and ZnO NW. The suspended ZnO NWs exhibited an average electrical resistivity ρ (approximately 2.3 × 10–2 Ω cm) and a high electron density n (exceeding 1.89 × 1018 cm–3), comparable to that of InP NWs, GaN NWs, and InAs NWs (1018∼1019 cm–3), suggesting the potential to drive advancements in high-performance NW devices. A maximum breakdown current density (J BD) of ∼0.14 MA/cm2 and a maximum breakdown power density (P BD) of 6.93 mW/μm3 were obtained, both of which are higher than substrate-bound ZnO NWs and consistent with previously reported results obtained from probed ZnO NWs grown vertically on the substrate. Moreover, we discovered that NWs experienced thermal breakdown due to Joule heating and exploited this breakdown mechanism to further investigate the temperature distribution along the ZnO NWs, as well as its dependence on the electrical properties and thermal conductance of contact electrodes. Thermal conductance was determined to be ∼0.4 nW K–1 and ∼1.66 pW K–1 at the tungsten(W)-ZnO NW and platinum(Pt)-ZnO NW contacts, respectively. In addition, we measured the elastic modulus (130–171 GPa), which closely approximated bulk values. We also estimated the nanoindentation hardness to be between 5 and 10 GPa. This work provides valuable insights into the electrical activity and extreme mechanisms, thus providing a better understanding of the potentials and limitations associated with utilizing suspended NWs in 3D nanodevices.

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Electrical Conductivity of Multiwall Carbon Nanotube Bundles Contacting with Metal Electrodes by Nano Manipulators inside SEM

Cited by 12 publications

References 51 publications

Establishing Ohmic Contact of a Radial Compressed CNT Bundle with High Work Function Metal

Establishing Ohmic Contact of a Radial Compressed CNT Bundle with High Work Function Metal

Welding Model for a Carbon Nanotube Bundle with Staggered Electrodes: Implications for Conductivity with Joule Heating

Electrical Activity and Extremes of Individual Suspended ZnO Nanowires for 3D Nanoelectronic Applications

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